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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group has a large assortment of hook locks for trucks, vans, and skip-loaders. We offer self-locking hooks with clevis to prevent pinching; ball-bearing hooks that swivel for better side stability and less weight and galvanized hooks that protect against corrosion. The performance of the hook lock mechanism was analyzed by combining a numerical continuance algorithm and bifurcation theories. Nine state variables were identi